Hillary Clinton, whose candidacy has revealed a generational schism among women, will campaign in Chicago today with the mother of Sandra Bland, who died in her jail cell three days after being pulled over for a routine traffic stop in Texas.

• The pope in Mexico.

Pope Francis visits a Ciudad Juárez prison today, the last day of his trip in the country, and he’ll visit the Mexico-U.S. border to show solidarity with migrants trying to cross it, stepping into a major issue of the 2016 campaign.

Back Story

In the annals of man versus machine, few contests can surpass Garry Kasparov versus Deep Blue, the world chess champion against the world’s most accomplished chess computer, for sheer drama.

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Garry Kasparov during his match against Deep Blue in 1996.CreditBarbara L. Johnston/Reuters

One was crowned a winner 20 years ago today, after a match in Philadelphia.

Deep Blue, which could search more than 100 million chess positions a second, was untested. Its best chance of winning was to take the early games of the six-game match before Mr. Kasparov caught wind of the computer’s tendencies.

Deep Blue trounced Mr. Kasparov in the opener. But, as expected, he picked up on Deep Blue’s weaknesses, and adjusted his game to exploit them.

It was all Mr. Kasparov in Game 2, followed by draws in Games 3 and 4. Then Deep Blue bungled its position in Game 5, and it was over. Mr. Kasparov won that one and Game 6.

Advantage, human race!

But the reign didn’t last long. Deep Blue won the rematch in 1997. It is now retired at the Smithsonian Institution.

An earlier version of this Morning Briefing misstated the speed at which Deep Blue could calculate chess positions. It was 100 million positions a second, not 50 billion in three minutes. (The larger figure refers to the speed of the upgraded model, used in the 1997 rematch.)